Similar to my test with Diffie-Hellman group 14 shown here I tested a VPN connection with elliptic curve Diffie-Hellman groups 19 and 20. The considerations why to use these DH groups are listed in the just mentioned post – mainly because of the higher security level they offer. I tested the site-to-site IPsec connections with a Juniper ScreenOS firewall and a Fortinet FortiGate firewall. (Currently, neither Palo Alto Networks nor Cisco ASA support these groups.)
Continue reading Site-to-Site VPNs with Diffie-Hellman Groups 19 & 20 (Elliptic Curve)